"Manaka de Ikuno!!" (developed by Leaf) is a game launcher for multiple titles, including 'Final Dragon Chronicle: Guilty Requiem', 'Mananatsu', and other such games. Released in 2009, it is a spin-off minigame collection of the ToHeart2 franchise of visual novels and video games.
The first file included is a .ZIP folder which contains everything necessary to install the game. The second file is the V1.04 update patch, which I highly recommend installing once you've finished downloading the game via the Setup.exe file inside of the .ZIP folder. It fixes some bugs, adds better keyboard support, and even provides some additional postgame content (for FDC:GR specifically) should you be up for the challenge.
Finally, I've even included some helpful text documents (only for Final Dragon Chronicle: Guilty Requiem) to help out players who can't get past the language barrier. In the final folder, you'll find some text documents I made translating the Title Screen, Main Menu, User Interface, and Battles. Controls (Mouse & Keyboard) are provided as well. I even went through the trouble translating some optional puzzles on the 14th Floor that probably would have been too difficult for non-Japanese players to figure out by themselves, with the help of a few good friends!
Do be warned that 'Manaka de Ikuno!!' does contain adult content, and is only intended to be played by adults over the age of 18. I do not take responsibility for any minors who may choose to play this game. Thankfully, the adult content itself is pretty tame overall and is not the focus of the core experience.
For more information, check out the VNDB link here: https://vndb.org/v2964
I also recommend checking out the Japanese Wiki for Final Dragon Chronicle. There's some really helpful stuff here, including skill effects, monster types, a dungeon guide, and more: https://w.atwiki.jp/drachro/
IMPORTANT NOTE - I do not take any credit, nor am I receiving any profit (be it monetary gain or otherwise) for sharing this software. My only motivation for sharing this is exclusively to preserve its value as a digitally distributed creation made by passionate and talented developers.